php ession php session
php中怎么设置session过期时间，当session过期后，session中的值无效，session 默认是浏览器关闭就失效的，但是可以用session_destroy() 来销毁所有session，也可以用unset 删除指定的session。
http://www.laruence.com/2012/01/10/2469.html
可以看看这个文章
ini_set('session.gc_maxlifetime', 5);
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